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22 Nanotechnology — Early Lessons from Early Warnings Emerging issues | Nanotechnology — early lessons from early warnings 22 Nanotechnology — early lessons from early warnings Steffen Foss Hansen, Andrew Maynard, Anders Baun, Joel A. Tickner and Diana M. Bowman Nanotechnology is the latest in a long series of technologies heralded as ushering in a new era of technology-driven prosperity. Current and future applications of nanotechnology are expected to lead to substantial societal and environmental benefits, increasing economic development and employment, generating better materials at lower environmental costs, and offering new ways to diagnose and treat medical conditions. Nevertheless, as new materials based on nanoscale engineering move from the lab to the marketplace, have we learnt the lessons of past 'wonder technologies' or are we destined to repeat past mistakes? This chapter first introduces nanotechnology, clarifies the terminology of nanomaterials and describes current uses of these unique materials. Some of the early warning signs of possible adverse impacts of some nanomaterials are summarised, along with regulatory responses of some governments. Inspired by the EEA's first volume of Late lessons from early warnings, the chapter looks critically at what lessons can already be learned, notwithstanding nanotechnology's immaturity (1). Nanotechnology development has occurred in the absence of clear design rules for chemists and materials developers on how to integrate health, safety and environmental concerns into design. The emerging area of 'green nanotechnology' offers promise for the future with its focus on preventive design. To gain traction, however, it is important that research on the sustainability of materials is funded at levels significant enough to identify early warnings, and that regulatory systems provide incentives for safer and sustainable materials. Political decision-makers have yet to address many of the shortcomings in legislation, research and development, and limitations in risk assessment, management and governance of nanotechnologies and other emerging technologies. As a result, there remains a developmental environment that hinders the adoption of precautionary yet socially and economically responsive strategies in the field of nanotechnology. If left unresolved, this could hamper society's ability to ensure responsible development of nanotechnologies. (1) This chapter is based on and in parts identical to Hansen, S.F., Maynard, A., Baun, A., Tickner, J.A. 2008. 'Late lessons from early warnings for nanotechnology', Nature Nanotechnology, (3/8) 444–447. 530 Late lessons from early warnings: science, precaution, innovation Emerging issues | Nanotechnology — early lessons from early warnings 22�1 What is nanotechnology and what Although the definition is broad, in most materials are nanomaterials? or systems it can be determined whether they involve nanomaterials or not (Hansen et al., 2007). Nanotechnology is often described as having roots in a wide range of scientific and technical fields, The range of nanomaterials that can be including physics, chemistry, biology, material manufactured is extremely broad. However the science and electronics. The field of nanotechnology techniques used to produce them can, roughly is thus broad and covers a multitude of materials, speaking, be divided into top-down and bottom-up techniques, scientific and commercial applications approaches. Top-down techniques involve starting and products (RS and RAE, 2004). Originally the from a larger unit of material, and etching or term nanotechnology, first used by Taniguchi in 1974, milling it down to smaller units of desired shape, referred to the ability to engineer materials precisely whereas bottom-up involves progressing from at the nanometre (nm) level (Taniguchi, 1974). The smaller sub-units (e.g. atoms or molecules) to make term has since been framed and reframed by various larger and functionally richer structures (RS and actors over the decades and, despite the desire for a RAE, 2004; BSI, 2007b). Top-down techniques unifying all embracing definition of nanotechnology, include processes such as high-energy ball milling, many versions of the definition exist today. Here, we etching, sonication and laser ablation, whereas use the widely-accepted definition suggested by the bottom-up techniques include sol-gel, chemical United States National Nanotechnology Initiative vapour deposition, plasma or flame spraying, (NNI): supercritical fluid, spinning and self-assembly (Biswas and Wu, 2005). Both approaches pose Nanotechnology is the understanding and specific challenges. Creating smaller and smaller control of matter at dimensions between structures with sufficient accuracy is a critical approximately 1 and 100 nanometers, challenge for top-down manufacturing, whereas where unique phenomena enable novel the challenge for bottom-up techniques is to make applications. Encompassing nanoscale science, structures large enough and of sufficient quality engineering, and technology, nanotechnology (RS and RAE, 2004). involves imaging, measuring, modelling, and manipulating matter at this length scale Starting with a palette of conventional materials, (NNI, 2009). new nanomaterials may be formed by subtly altering the shape, size and form of these materials Chemistry typically deals with large numbers of at the nanoscale. A further range of nanomaterials atoms and molecules acting together. The behaviour with new properties may be developed by of individual atoms and molecules can best be combining two or more nanoscale materials. understood within a quantum physics-based Familiar chemicals may also be used to construct framework, while the motion of massive collections new nanometre-scale molecules and structures, of atoms and molecules such as physical objects such as carbon-60 and carbon-70 molecules under the influence of force are best described (C60 and C70), carbon nanotubes, nanoscale through classical mechanics or Newtonian physics. liposomes, self-assemble monolayers, dendrimers Nanotechnology falls between these two domains and aerogels. Various international standardisation and holds the possibility of revealing and exploiting institutes have expanded their focus of attention unique novel phenomena as a result. from trying to define nanotechnology to defining the nature of the many different kinds of Although the wordings differ, a number of definitions nanomaterials such as carbon nanostructures, require that two criteria must be fulfilled for materials nanorods and nano-objects (BSI, 2007; ISO, 2008). to be considered as engineered nanomaterials (2): In order to facilitate hazard identification and • they must have some purposely engineered focus risk assessment, a procedure for dividing structure with at least one dimension in the nanomaterials into relevant subcategories has been approximate range 1–100 nm; developed by Hansen et al. (2007), as illustrated by Figure 22.1. • this nanostructure must give the system properties that differ from those of the bulk forms Hansen et al. (2007) suggest categorisation of of the same material. nanomaterials depending on the location of the (2) Nanomaterials in this context specifically refer to materials that have been purposely engineered to have nanoscale structure. Late lessons from early warnings: science, precaution, innovation 531 Emerging issues | Nanotechnology — early lessons from early warnings Figure 22�1 The categorisation framework for nanomaterials� The nanomaterials are categorised according to the location of the nanostructure in the material Source: Hansen et al., 2007, reprinted with permission. nanoscale structure in the system. This leads to a between 1 and 100 nanometre (3). Category III above division of nanomaterials into three main categories: contains nanostructured nanoparticles that can have various forms and shapes and this category • materials that are nanostructured in the bulk; includes, for example, quantum dots, fullerenes, nanotubes and nanowires (Maynard and Aitken, • materials that have nanostructure on the surface; 2007). There are four subcategories of systems with nanoparticles, depending on the environment • materials that contain nanostructured particles. around the nanoparticles: Nanoparticles have been defined by the ISO (2008) • subcategory IIIa has nanoparticles bound to the as particles having three external dimensions surface of another solid structure; (3) It is important to note that this is not a universally accepted definition and that, as with the term nanotechnology, a number of different definitions as to what constitutes a nanomaterial exists. The articulation by the European Commission of their recommendation for a definition is discussed in detail in Section 22.5 of this chapter. 532 Late lessons from early warnings: science, precaution, innovation Emerging issues | Nanotechnology — early lessons from early warnings • subcategory IIIb consists of systems where scientific research publications in nanotechnology nanoparticles are suspended in a liquid; (Linkov et al., 2009). Scientific activities sparked by government funding have had a crucial role in • subcategory IIIc is nanoparticles suspended in nanotechnology-related knowledge creation and solids; technology transfer, although there is often some time lag before scientific knowledge is diffused into useful • subcategory IIId consists of airborne inventions and applications (Igami and Okazaki, nanoparticles. 2007). Most health and environmental impact concerns have been raised over nanoparticles
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